Torchwood and Doctor Who star John Barrowman has teamed up with his sister Carole to pen his first Torchwood novel, Exodus Code, and he’s so pleased with it, he’d like it to become the fifth series.

“I’d love to see this book become the series or to become something in the future that could be done on screen with Torchwood,” John Barrowman tells us, “and that is why it was important for [Exec Producers] Russell [T Davies] and Julie [Gardener] and the BBC to have their input, because if the show did continue then this must make sense.”

The plot follows the events of Miracle Day, the fourth series of Torchwood, and Captain Jack [Barrowman] and Gwen [Eve Myles] are racing to save humanity. Women are being driven insane by heightened and scrambled senses, leaving governments and scientists baffled.

This global scale is the direction Barrowman would like to see Torchwood take if it were to return. “I think every time Torchwood comes back it has to be something different,” he says. “We’ve always been challenged; we’ve been moved from network to network each series so we always have to build from scratch so I think if Torchwood comes back it needs to be on a bigger, global scale.”

The future of the show is still uncertain, however. “We haven’t been told no or yes, we’re in limbo.” But Barrowman is ready if it ever does: “Listen, I’ve always said if they ask me to put the coat on I will do happily because I love Jack,” he says. “I have it here ready!”